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OSLO, Norway — The Norwegian who became a hacker hero for developing software to unlock copy-protection codes on DVD movies said he needed only one day to crack Google’s new video viewer.

Jon Lech Johansen, also known as DVD Jon, posted software on his “So Sue Me” Web site that he says modifies the viewer so that it plays videos hosted on any server. The company’s Google Video Viewer, in turn, was modified from the free VLC media player to restrict it to playing video hosted on Google’s own servers.

Johansen’s modification wasn’t difficult, as Google already had posted its code on its Web site. And the change won’t let users break any video encryption; it only lets them view non-Google content.

“This modification of Google’s open source video viewer does not (compromise) the integrity and security of content available from Google Video in any way,” Google spokesman Nate Tyler said in a statement.

Nonetheless, he advised users against installing the change, saying “it could result in security vulnerabilities on their computer and may disrupt their computer’s ability to access Google Video.”

Johansen, 21, became a folk hero to hackers at age 15, when he posted software called DeCSS to unlock the Content Scrambling System, or CSS, the film industry used on DVD movies to prevent illegal copying.

After the film industry complained, Norwegian authorities charged him with data break-in, but Johansen was acquitted at trial and on appeal.

Johansen, an advocate of the open-source philosophy of making software code freely available for inspection and sharing, has also repeatedly posted programs that circumvent the copy-protection technologies on Apple Computer’s iTunes software.

Google’s shares have more than tripled to more than $300 in the 10 months since their debut. Most of the company’s income is from online advertising, although it could boost revenues by charging for some videos in the future.

The company has been stockpiling amateur and professional videos since April, when it asked users to submit their images, and the new viewer allows them to sample the collection for free.

The Google Video Viewer, consisting of about 1 megabyte and still officially in a “beta” test phase, was designed to do nothing but stream Google’s videos through the Internet Explorer or Firefox Web browsers. Its limited scope meant it wouldn’t be competing with the popular multimedia players made by Microsoft and RealNetworks.